Phenanthrenequinone‐Modified Conjugated Polymer Enabling Photocatalytic H 2 O 2 Generation via Efficient O 2 − Conversion

Abstract The photocatalytic O 2 reduction reaction offers a promising approach to synthesizing H 2 O 2 . Nevertheless, the low conversion efficiency of O 2 − constrains the efficiency of photocatalytic H 2 O 2 production. This is because O 2 can readily obtain electrons to generate O 2 − , but it is challenging to reacquire electrons after generating O 2 − . Accordingly, this study proposes the improvement of the conversion efficiency of O 2 − through the directional enrichment of photogenerated charges at sites of O 2 − reduction and stabilization of O 2 − . This study introduces a phenanthrenequinone group with adjacent carbonyl groups as the O 2 − reduction reaction site. The directional enrichment of photogenerated charges at the O 2 − reduction site enhances the probability of O 2 − obtaining electrons. Concurrently, the special adsorption configuration enhances the adsorption, and stabilizes·O 2 − on the catalyst surface, accelerating the conversion of O 2 − to H 2 O 2 and achieving an H 2 O 2 generation rate of 3400 µmol g −1 h −1 . This work presents an innovative tactic regarding the efficient reduction of O 2 − to H 2 O 2 , which informs the structural design of advanced photocatalytic systems for the production of H 2 O 2 .